Key performance indicators and leg positioning for the kick-start in competitive swimmers

Burkhardt, David; Born, Dennis-Peter; Singh, Navrag B; Oberhofer, Katja; Carradori, Sergio; Sinistaj, Suzanne; Lorenzetti, Silvio (2020). Key performance indicators and leg positioning for the kick-start in competitive swimmers Sports Biomechanics, pp. 1-15. Taylor & Francis 10.1080/14763141.2020.1761435

[img]
Preview
Text
Lorenzetti_2020_Key performance indicators and leg positioning for the kick-start in competitive swimmers.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (2MB) | Preview

The aim of the study was to (1) assess the test-retest reliability of a novel performance analysis system for swimming (KiSwim) including an instrumented starting block and optical motion capture system, (2) identify key performance indicators (KPI) for the kick-start, (3) determine the most beneficial position of the strong leg and (4) investigate the effect of acute reversal of leg positioning. During three sessions, kick-starts of 15 competitive swimmers were investigated. Eighteen kinematic and kinetic parameters showed high reliability (ICC>0.75) from which principal component analysis identified seven KPI (i.e., time to 15 m, time on-block, depth at 7.5 m, horizontal take-off velocity, horizontal impulse back plate, horizontal peak force back plate and vertical peak force front plate). For the preferred start position, the back plate showed a higher horizontal peak force (0.71 vs. 0.96 x body mass; p < 0.001) and impulse (0.191 vs. 0.28Ns/BW; p < 0.001) compared to front plate. Acute reversal of the leg position reduced performance (i.e., increased time to 15 m and reduced horizontal take-off velocity). However, plate-specific kinetic analysis revealed a larger horizontal peak force (p < 0.001) and impulse (p < 0.001) for the back compared to the front plate in any start position investigated. Therefore, swimmers are encouraged to position the strong leg in the back.

Item Type:

Journal Article (Original Article)

Division/Institute:

Swiss Federal Institute of Sports Magglingen SFISM > EHSM - Leistungssport

Name:

Burkhardt, David;
Born, Dennis-Peter;
Singh, Navrag B;
Oberhofer, Katja;
Carradori, Sergio;
Sinistaj, Suzanne and
Lorenzetti, Silvio

ISSN:

1476-3141 (Print) 1752-6116 (Online)

Publisher:

Taylor & Francis

Language:

English

Submitter:

Admin import user

Date Deposited:

16 Mar 2021 14:39

Last Modified:

30 Sep 2021 02:18

Publisher DOI:

10.1080/14763141.2020.1761435

Related URLs:

PubMed ID:

32462985

Uncontrolled Keywords:

Force plate Freestyle Reliability Start position Swimming

ARBOR DOI:

10.24451/arbor.14417

URI:

https://arbor.bfh.ch/id/eprint/14417

Actions (login required)

View Item View Item
Provide Feedback